22021311221 has 32 divisors (see below), whose sum is σ = 27260771328. Its totient is φ = 17322439680.

The previous prime is 22021311209. The next prime is 22021311227. The reversal of 22021311221 is 12211312022.

It is not a de Polignac number, because 22021311221 - 2⁶ = 22021311157 is a prime.

It is a self number, because there is not a number n which added to its sum of digits gives 22021311221.

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (22021311227) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 23106881 + ... + 23107833.

It is an arithmetic number, because the mean of its divisors is an integer number (851899104).

Almost surely, 2^22021311221 is an apocalyptic number.

It is an amenable number.

22021311221 is a deficient number, since it is larger than the sum of its proper divisors (5239460107).

22021311221 is a wasteful number, since it uses less digits than its factorization.

22021311221 is an odious number, because the sum of its binary digits is odd.

The sum of its prime factors is 2181.

The product of its (nonzero) digits is 96, while the sum is 17.

Adding to 22021311221 its reverse (12211312022), we get a palindrome (34232623243).

The spelling of 22021311221 in words is "twenty-two billion, twenty-one million, three hundred eleven thousand, two hundred twenty-one".